Pneumatic hammer-drill.



H. SCHUMACHER.

PNEUMATIC HAMMER DRILL. APPLICATION FILEDMAR. 19, $912.

Z SHEETS-SHEET l.

Patented Nov. 21, 1916.

H. SCHUMACHER.

PNEUMATIC HAMMER DRILL.

APPLICATION FILED MAR. I9, 1912.

1,205,485. Patented Nov. 21, 1916.

2 SHEETS-SHEET 2.

VVEN' Haw @524 umacfien' A TTORNEY.

UNITED STA PATENT OFFICE.

HENRY soHUMAcTnnn, on D NVER, coLoRADo.

l huH c/ton iz may (-o/wcrn lie it. known that I. I'IEXRY ScnUMAoHnR, a citizen of the United States. residing in the cityand county of Denver and State accompanying drawings end to thedigures of reference marked thereon. which form a partof this specification.

My invention relates to improvements.1n pneumatic rock drills and has for its ob]ect the'provision of. a machine of this character constructed toniaintain av constant air pressure between the feed cylinder and the motor. i

Another ob ect of my invention resides in .the provision of a pneumatic drill simple and inexpensive in manufacture and effec- .tive, and economi al in operation.

Another object of my invention is to provide novel fluid controlling means ,of an eX- ceedingly simple character for controllingthe fluid to the feed cylinde and the motor.

Another object is to provide a simple valve for controlling the motive fluid to the feed cylinder and the'n'iotor. i

Another object of my i nventionresides in the provision of means for supiilying'lubricant to the different parts of the. motor.

Another object of my invention'is-to providenov'el and efficient means for c0ntrolling the air pressure in the feed cylinder in accordance with the nature of the work to be performed bv the drill.

\Viththese and other objects in view I will proceed to describe my invention with reference to th' accoinpiuiying t'crmin da part iereof.

1n the drav :Figure 1, is a side elevation of the' drill. showing the same in assembled condition. Fig. 2. is'a longitudinal section of the drill. Fig. 3 is a cross sectional view taken on the line 33 of Figs. 1 and 2. -Fig. 4 is a. bottom view of the valve block. Fig. 5 is av view taken on the line A .A,.-Fig. 4, looking in thedirection of the arrow. Fig.6 is a view illustrating; the

position of the valve piece to cut off the ino-' tive fluid from the feed cylinder and the motor. Fig. 7 1s a view illustrating the po- Specification. of Letters Patent.

drawings PNEUMATIC HAMMER-DRILL.

Patented Nov. 21, 1916.

Application'fi led March 19, 1912. Serial'No. 684,332. I

sition of the valve piece to admit motive fluid to the feed cylinder. Fig. .8 is a view illustrating the position of the valve piece to admit motive fluid toboth the feed cylinder and the motor. Fig. 9 is a view illustrating the position of the valve piece to ad- .mit motive fiuidto the motor and to'admit motive fluid to the feed cylinder under con- 1' trol. the valve piece Fig. 11 'is a, section taken on the line 1111 Fig. 2. Fig.'12 is'a side elevation of the valve block showing the niotor induction passages and circumferential passage with which the latter communicates! The same referenceicharacters indicate the same parts inall the views.

Let the numeral 5 designate the feed cylinder of my improved drill, and 6 the motor thereof. In the feed cylinder 5, I arrange" a piston stem or rod 7, which is adapted to engage the'wall or other suitable stop; To this'piston stem or rod 7, within thecylin a der 5,1 secure a head 8 by means of a screw 9, which'passes through the head 8 and enters the stem '7. Interposed between the head 8 and the stem 7 I arrange a leather gasket 10 and surrounding the head 8, I mount an expansion ring, 12,"which is adapt- Fig. 10 15 .1. view of the face side of l ed to expand into an enlarged portion 13,

of the cylinder 5 for holding the piston stem 7 in position in the cylinder 5 when the drill is in an iii-operative position or theportableposition. This ring 12 expands into the enlarged portion 13 of the cylinder f) arid thus holds thepiston stem 7 against displacement or movement in the cylinder 5.

.I will now proceed to describe the constru'ction and arrangement of the valve for controlling the motive fluid to the motor and feed cylinder. By referring to Fig. 2; it willbe noticed that this valveis interposed between the feed cylinder and the motor 'as.

is usual in machines of this character.

My improved valve consists of block 4;?

having sockets 43 and 44 formed on opposite sides thereof and adapted to "respectively vreceive oneextremity of the feed cylinder iiio and one extremity of the motor (5. Therefore when my improved machine a'ssem-' one ofwhich is secured to the said cylinder, while the other is secured to the chuck end of the motor (3, the said collars having ears through which rods are passed for connecting said collars. Another collar 45 is interposed between the collars 24, and is provided with ears through which the said rods also pass The valve block 42 is provided with an opening 46 passing therethrough and adapted to receive a. hollowstem 47 of a disk valve piece +18. One side of the valve block 42 is cut out to form a cup or recess 4!) adapted to receive the disk valve piece 48. Into this cup or cut out: portion 49. I thread a cap 50 as shown at (30. This cap is provided with a centrally located threaded opening 61, adapted to receive the motive fluid feed pipe. To the extremity of the valve stem 47 opposite the disk valve 48. I Secure an operating handle or member 62. This operating handle 62 also serves the purpose of a washer or lock for holding the disk va lv 48 in close engagement with its seat. Also arranged. in the valve block 32. parallel with the valve stem +T is a passage 63. which passage communicates with the induction passages 28 and 29 of the motor respectively, through ports (H and 65 leading from a circumferential passage formed in the valve block r2.ff\vith which the passage (33 is in direct colnn ilnication.' The valve block 42 oppositc'tlie passage 63 is provided with a lougiuulinally arranged passage (36, which passage. communicates with the feed cylinder 5 through a port (if. The hollow 6b of the valve stem 47 is adapted to receive a supply of lubricant. which is fed to the motor in a manner which will hereinafter he described. 'lhishollow (38. of the valve stcm'li'. is adapted to he closed by means of a threaded plug or thumb screw 69.

In Fig. l. I have illustrated a diametrical arrangement of the ports and passages formed in the valve block aml in this view the position and direction of the passages is indicated. Now by referring to Fig. (3. them )osition of the disk valve 'iicce to close oil the motive tluidfrom the feed cylinder and motor. is indicated. By turning the disk valve piece 48 to the right, or to the position indicated in Fig. 7. the conimunication will be established with the feed c 'lindcr through an elongated slot 70. with which the disk valve piece is provided and through the passage (36, which leads to the interior of the cylinder 5 in the rear of the piston,

'- whereby the live motive fluid will maintain the stem 7 of the piston in close engagement with the wall or other support or stop and will. carry the motor 6 forwardly toward the surface to be worked or drilled. \Vhen the disk valve piece 48 is in the position in dicated in Fig. 7, the induction is established only with the feed cylinder I. while the induction of the motive fluid to the motor is closed off. In other words. the motive fluid is first admitted to the feed cylinder 5 so as to set the drill for work. Now by turning the disk valve piece 48 to the position indicated in Fig. 8, a relatively large enlarged slot 71 will he brought into register or comnnmication with the passage HI, which leads to the motor. 'lhus. thc induction of the motive fluid will be established in the motor and will start the latter in operation. The slot is of sutlicicnt length to remain in register with the passage (36 during the turning of the valve piece 48 to bring its slots Tl into register with the passage on. Now when the valve, piece 48 is in the position represented in Fig. 5, the drill is set for operation.

Now assuming that it is desired to regulate the pressure in the feed cylinder 5 according to the character of the material in which the drill is working the disk valve piece 48 may be turned to the position represented in Fig'. 9. \vhcreb an elongated rcccss 72 formed on the side of the valve piece 48, adjacent the seat of the latter. will be brought into rcgister with the passage (3t; and a passage 73. which lcadsto a relief valve 'T-t, while the elongated slot T1 of the valve piece 48 will still be in register with the passage 63 leading to the motor. Thus. the motor is allowed to be operated at full speed by virtue of the motive lluid. while the pressure in thc l'ccd cylinder 5 is reduced and is governed by virtue of thc rcliel valve 7-4. The valve piccc 4H is provided \vitlra relatively small opcning 75 whi h communicatcs with the recess T12. 'lhcrcl'orc only a limited amount of motive lluid can pass through the valve piece 4H into the recess 72. froui whence it dcr 5 through the passage 66. log a set screw 7 lhrcadcd in the casing 77. of the relief valve 74.11atcnsiou of a spring 78 may be rcgulatcd for controlling a valve piece 75). .'\'ow if it is dcsircd to operate the motor under a relatively low pressure in the feed.cylinder;thc.tension ol thc sprim TS may be lessened by the adjustment ol the screw 76. whereby. whenever the pressure in thc fecd cylinder 5 becomes high the motive lluid will operate the valve piece 79to move the latter away frinn an opening 80 formed in the seat 81 aml conununication ol'qthe feed cylinder with the atmosphere willbc thus established through the passage (36. recess 72. passage 73 and opening 80 formed ib the valve sleeve 81, and opening 82 formed in the valve piece 42 and communicating with thc atmosphere. \Vhen drill is working in soft material, it is very necessary to prevent the drill steel from being moved too rapidly into the material and thus choking up the drill.- Therefore, my arrangement wherein passes into the feed cylin;

liy ad ust piece, This passage 85 is valve piece the pressure in the .feed' cylinder is regulated in accordance with the material in which the drill isworking, is an important feature inja machine of this character.

Now, ifit' desired to cut off the motive fluid from the feed cylinder and motor 'for n stopping the operation of the drill, the 'alve piece 48 may be' tihtned to. the position indicated in .Fig. 6, whereby a recess &3, formed onthe side of-the valve piece 48-, ad'- jacent the seat of the latter, will be brought into register with the passage 66 and an eX- hau'st passage 84, leading through the valve piece 42 to the atmosphere. Thus the induction of the motive fluid to the motor and the feed cylinder will be cut off and the feed cylinder placed in communicatimi with the exhaust through the passage (36, recess 83 and passage 84, allowing the motive fluid in the feed cylinder to exhaust so that the steni 47 of the feed cylinder piston maybe disengaged from the wall or support for removing the drill.

The valve piece l8 is provided with a passage 85, comn'iunicating with the chamber 68, formed in the steni47 of the valve provided with a port 86, which is apted to be brought into register with the passagefiii, whereby the oil or lubricant maybe-suppliedfrom the chambet-'68 to the motor (3. hen the lubricant has been once admitted. it wjll be carried into the motoalong with the induction of the motive fluid.

the extrei-nity of the valve block 42 adjacent the handle or o )eratin" member (3'). is )ro 2* vided with a recess or chamber-R7 in which lax-range a spring88 and a pm or plug 89 which s-engaged by the said spring 88 and is normally extendedbeyond the said chains I ber 87, under the influence ot' the spring 88, into engagement with a recess 85) formed on'the lower edge of a collar 90 of the handle (52. This recess 85) is provided with notches or recesses 91, which are adapted to receive the beveled extremity 92 ot' the pin 89, when the valve. piece 48 is in any of the positions corresponding with that illustrated in Figs. (5 to 9 inclusive, for maintaining the *n ent. i

Now assuming that'it is desired to set the drill for operation the piston 7 of the cylinder 5 is placed in engagement with the wall cylinder 5 and calise the. motort0 move for-' wardly into engagement with the face of the surfaceto be drilled, then by further turn- 'ing of the handle 62, the disk 48 may be Attention is here called to the fact, that 48 in position against displaceof a tunnel or any other suitable stop andaga i list the material .the handle (52 may be turned for imparting a corresponding turn to the disk 48 for bringing the recess Tl into regi'ster with the passages 73 and'tit'i.whereby the motive fluid will pass through the relatively small openin T5 in the disk in into the recess T2 and thence. through the recess and passage (36 to the feed cylinder 5 and as soon as the pressure in the cylinder '5 increases to too great a degree, the valve piece Til-will be forced from itsscat and coininii'iiication between the feedcylindc andthe;atinos phere established through the recess T2."pa sage 73, openings and Sfll wherc l pressure in the feed cylinderavill be decreased sutliciently. The pressure ,to be maintained in thesfeed cylinder,isjdetermined and the valve T-l is set accordingly to relieve the pressure in the teed cylinder hetore it goes above the desired degrei j'xow supposing that the drilling operation has drill to another location. the handle i j be turned to impart a correspon'di'i' ment :8 to bring the latter to a p indicated in Fig. (it whereby theslot connect the twopassagcs tili'andfil place the feed cvlinder 5 in coni'niui with the atmosphere through the'pa" e er. reccss flli and passage tal. 'lhiisthe. ii

fluid in the feed cylinder 3 will ekliaiistfand release thc,piston 7 from enga'geineiit"with the wall or support, whereupon tht pis- "--ton 7 may be nioved inwardly tobrii'iglthe expansion ring 12 into the elongated portion li-Lotthe cylinder In thisposition the. expansion ring 12 will expand int the, elongated -iortionylit and secure the piston 7 in position against movement or disengagement from its inward drawn position. .()i course, when the valve piece 48 lras'fheen turned to the position indicated in Fig. 6

the motivev fluid supply has been cut oti t'i oni both the teed cylinder and the motor fand I consequently the feed cylinder and motor are both iii-operative and as soon as the air exhausts from the feed cylinder in tlie'in air #ner above described, thedrill' may be removed and placed in any other desiredloca- .tion. 1

Having thus described my invention,v what I claim is:

' the been completed and it is desired to move the l. The combination with a motor and fluid sage for establishing connnnnication of said miltive fluid with said motor.

2. In a machine of the character set forth, the combination with a tiuid'operated motor, and fluid operated feeding means for the motor. of controlling means interposed be tween the motor and the motor feeding means, the said means having passages communicating respectively with the moto' and the motor feeding means, a disk valve having slots therein adapted tobe brought into register with the aforesaid passages. and said disk valve having a restricted opening adapted to register with the passage leading to the feeding means after the said slot has been moved out of register with the latter. substantiallflas described.

3. In a machine of the character set forth. the combination with a moto' and a motor l'eeding cylinder. of means for controlling the supply of motive fluid to the motor and the motor feeding cylinder. comprising a valve interposed between the motor and the motor feeding cylinder. tilt block having passages communicating respectively with the moto and the motor feeding cylinder. a valve piece for controlling the said passages. said valve piece having slots adapted to register with the passages in the valve. block. one oi the said slots of the valve piece being located to register with the passage communicatiiig with the feed cylinder before the other slot registers with the passage comnnmicating with the motor. and said valve piece having a restricted opening adapted to follow the lirst namcd slot into register with the passage communicating with the feed cylinder.

4. In a machine of the character set forth, the combination with a motor and feeding means for the motor. of means for controlling the supply of motive fluid to the motor and the motor feeding means, comprising a valve interposed between the motor and the lnotor feeding means, the valve block ha vin' passages communicating respectively with the motor and the motor feeding means, and a valve piece for controlling the said passages, said valve piece having slots adapted to be brought into register with the passages in the valve block, one of the said slots in the valve piece being adapted to be brought into register with the passage leading to the feeding means, before the other slot comes into register with the passage leading to the motor, and said valve piece having a reduced opening adapted to register with said passage leading to the feeding means after the said slot has been moved out of register therewith for admitting motive fluid to the feeding means under control, substantially as described.

f). In a machine of the class described the combination with a motor'and a feed cylinder, of motive fluid controlling means interposed between the motor and the feed cylinder, said means comprising a valve block having passages formed therein and respectively communicating with the motor and feed cylinder, and a valve piece open able in the said valve block and having slots. one of which is adapted to register with the passage leading to the motor, while the other is adapted to register with the passage leading to the feed cylinder, the slot adapted to.register with the passage leading to the feed cylinder being positioned in the disk with respect to the slot adapted to register with the passage leading to the motor so that the slot adapted to register with the passage leading to the feed cylinder will register with the said passage betore the other slot registers with the passage leading to the motor, and said valve piece having a restricted opening positioned to register with the passage leading to the feed cylinder while the first named slot is still in register with the passage leading to the motor.

(3. In a machineof the class described. the combination with a motor and a feed cylinder. of motive fluid controlling means, for the motor and the feed cylinder, said means comprising a valve. and passages controlled by the said valve. leading respectively to the motor and feed cyliinler, the valve having openings positioned with respect to the said passages so that one of the openings will register with the passage leading to the feed cylinder before the other opening registers with the passage leading to the motor, and said valve having a, restricted opening adapted to register with the passage leading to the feed cylinder while one of said openings remains in register with the passage leading to the motor. snbstantiall as described.

7. In a machine of the character set forth, the combination with a motor and a motor feeding cylinder, of' means for controlling the supply of motive fluid to the motor and motor feeding cylinder, the valve block having a feeding cylinder supply passage and a motor supply passage, avalve. piece for controlling said passage, said valve piece having an elongated slot adapt-ed tdregister with the feed cylinder supply passage, said valve piece having a second elongated slot passage after depl ted with the feed cylinder supply pas- Sag adapted to register with the motorsupply the first named slot has rege, and said valve piece having a restricted opening adapted to register with the feed cylinder supply passage after the first:

motor feeding means, of means for controlling the supply of motive fluid to the motor I and motor feeding means, comprising a feeding means supply passage and a motor supply passage, a valve piece controlling said passages, said valve piece having a slot adapted to be moved into register with the feeding means supply passage, said valve piece having a second slot adapted to register with the motor supply passage after the first named slot has registered with the feeding means supply passage, the structure also having an exhaust passage, and the valve piece having an elongated recess adapted to connect the feeding means supply passage and the said exhaust passage after the first named slot has been moved out of register with the feeding means supply passage and while the second named slot yet remains in register with the motor supply passage, and said valve piece having a restricted opening communicating with said recess.

9. In a machine of the class described, the combination with a motor and a motor feeding means, of means for controlling the supply of motive fluid to the motor and motor feeding means, comprising a feeding means supply passage and a motor supply passage, a valve piece controlling said passages, said valve piece having an openingadapted t o be moved into register with the feeding means supply passage, said valve piece having a second opening adapted to be moved into register with the motor supply passage after the first named opening has registered with the feeding means supply passage and while the second named opening is still in register with the motor supply passage, the valve piece having a restricted opening communicating with said recess, and an exhaust valve controlling the said exhaust passage.

In testimony whereof I affix my signature in the presence of tWo witnesses.

HENRY SCHUMACHER. Witnesses:

OLGA Brennan; J NO. G. POWELL. 

